A U.S. Marine uses an optic lens to scan for improvised explosive devices as he learns how to mark improvised explosive devices on Camp Leatherneck in Afghanistan's Helmand province, Dec. 20, 2013. A U.S. Marine uses an optic lens to scan for improvised explosive devices as he learns how to mark improvised explosive devices on Camp Leatherneck in Afghanistan's Helmand province, Dec. 20, 2013. SHARE: Download: Full Size (1.81 MB) Tags: Photo Essays Credit: VIRIN: 085018-M-LZB04-642.jpg Photo Gallery